Usl XTD-33 User manual

Film-Tech
The information contained in this Adobe Acrobat pdf
file is provided at your own risk and good judgment.
These manuals are designed to facilitate the
exchange of information related to cinema
projection and film handling, with no warranties nor
obligations from the authors, for qualified field
service engineers.
If you are not a qualified technician, please make no
adjuatments to anything you may read about in these
Adobe manual downloads
www.film-tech.com

Ultra★Stereo Labs, Inc. • 181 Bonetti Drive
San Luis Obispo, CA 93401
Telephone [phone] • e-mail [email protected]
XTD-33
Digital Crossover
Quality Cinema Products
INSTRUCTION
MANUAL

XTD-33 INSTRUCTION MANUAL ULTRA★STEREO LABS, INC.
- 2 -
One Year Limited Warranty
★★★★★
Ultra★Stereo Labs, Inc. warrants that each product manufac-
tured by it will be free from defects in material and workmanship
under normal usage for a period of one (1) year after its purchase
new from an authorized dealer. Our obligation under this
warranty is limited to repairing or replacing any product or
component which we are satisfied does not conform with the
foregoing warranty and which is returned to our factory, freight
paid, or serviced by one of our authorized contractors. The
foregoing warranty is exclusive and in lieu of all other warran-
ties, whether expressed or implied. Such warranty shall not
apply to any product or component (A) repaired or altered by
anyone other than Ultra★Stereo Labs or an authorized service
contractor; (B) tampered with or altered in any way or subjected
to misuse, negligence or accident or (C) which has been improp-
erly connected, installed or adjusted other than in accordance
with Ultra★Stereo Labs instruction.
0100
© 2000 All Rights Reserved
Ultra★Stereo Labs, Inc.
181 Bonetti Drive
San Luis Obispo, CA, 93401USA.
Telephone [phone]
FAX [phone]
e-mail: [email protected]
Quality Cinema Products

XTD-33 INSTRUCTION MANUAL ULTRA★STEREO LABS, INC.
- 3 -
Please record the following information for your records:
Model: ___________________ Serial Number: ___________
Date of Purchase: __________ Purchased from: __________
Topic Page
Introduction ............................................................................. 5
Scope of this Manual...................................................... 5
Safety Notices ................................................................ 5
Unpacking ..................................................................... 6
Configurations and Options ........................................... 6
Technical Specifications .......................................................... 7
Declaration of Conformance, CE.............................................. 7
XTD-33 Front Panel ................................................................. 8
XTD-33 Rear Panel ................................................................ 10
Theory of operation ............................................................... 12
Normal operation ......................................................... 12
Speaker Protection (Anti-Thump).................................. 13
Backup System ............................................................. 13
Installation ............................................................................. 14
Equipment needed ....................................................... 14
System Hardware Mounting and Grounding ................ 14
Power Connection, Main Voltage Selection, and Fuse.. 15
Rear Panel Signal Input Connections ............................ 16
Rear Panel Signal Output Connections ......................... 17
Optional Signal to Chassis Grounding .......................... 17
Front Panel Controls..................................................... 18
Alignment .............................................................................. 19
Selecting Speaker Type ................................................ 19
Setting Input levels ....................................................... 19
Setting Output levels .................................................... 20
Emergency Bypass setup .............................................. 20
Operation .............................................................................. 21
Normal Operation ........................................................ 21
Bypass Operation ......................................................... 21
Updating the Program and Crossover Files ................... 21
Appendix ............................................................................... 22
Connector pinouts ........................................................ 22
Crossover List ............................................................... 22
Trouble Shooting ................................................................... 23
Fuse replacement ......................................................... 23
Table of Contents

XTD-33 INSTRUCTION MANUAL ULTRA★STEREO LABS, INC.
- 4 -

XTD-33 INSTRUCTION MANUAL ULTRA★STEREO LABS, INC.
- 5 -
Introduction
General
The XTD is designed as an easy-to-set-up, high performance digital crossover.
It is designed to match the most commonly used speaker types currently
produced by several manufacturers. The 96kHz sample rate, 24-bit resolu-
tion and flexible firmware assures it will meet the demands of future speaker
designs. It may be used with other equipment, such as room equalization
equalizers, to isolate specific functions and provide a complete audio
processing system. The XTD is compatible with all commercially available
sound processors.
Scope of this Manual
This manual is to aid in the installation and operation of the XTD-33 Digital
Crossover. Because the XTD is designed for use with specific speaker systems,
there may be situations that the XTD cannot correct (e.g., a room with
excessive acoustic absorption or a power amplifier without sufficient power).
Please contact USL if you have any questions
Safety Notices
Review the following safety precautions to avoid injury and prevent damage
to this product. To avoid potential risk, use this product only as specified and
only for the purpose described in the instruction manual.
To Avoid Fire and Personal Injury:
• Use Correct Power Cable. Use only the power cable provided. Ensure
that the AC power outlet is located near the product and is easily acces-
sible.
• Use a Correctly Grounded Power Source. The Power Supply earth ground
is established through the ground conductor in the power cable. To avoid
the potential of electric shock, the ground conductor must be correct.
• Observe Source Ratings. To avoid risk of fire or electric shock, the power
source must be 110 - 120 VAC, 60Hz or 220 - 240 VAC, 50 Hz.
• Do Not Operate this Product with Any Enclosures Opened or Removed.
• Avoid Exposed Circuitry. Do not attempt to open the Power Supply be-
cause its safety certification would be invalidated.
• Do Not Operate with Suspected Failures. If you suspect there is damage
or malfunction with this product, call the factory.
• Do Not Attempt Repair. Only a trained factory service person is autho-
rized to repair this product.
• Do Not Operate this Product Near Heat Sources. This product should not
be located near heat sources such as radiators, heat registers, or stoves.

XTD-33 INSTRUCTION MANUAL ULTRA★STEREO LABS, INC.
- 6 -
• Provide ProperVentilation. The operating temperature should be between
0º C and 50º C. The humidity should be <90% at 40º C or below and
<60% at 41º C to 50º C. The cooling method is by convection.
• Keep Product Surfaces Clean and Dry. Disconnect the power cable from
the power source before cleaning. Do not use liquid cleaners or aerosol
cleaners. Use a damp cloth for cleaning.
• Do Not Push Objects Into Opening of this Product. Never insert objects
into the product through openings.
• Do Not Operate In Wet or Damp Conditions.
• Do Not Operate In an Explosive Atmosphere.
• Prevent the Spilling of Liquids onto the System Components.
• Inspect the power cable and all cables prior to use. Confirm that the
power cable and other interconnecting cables are free from damage.
Safety Standard
The EN 60065 standard specifies safety design requirements that reduce or
eliminate the risk of personal injury to both the product user and service
personnel. This product is designed and tested to meet the standards of the
International Electrotechnical Commission (IEC) European Norm (EN) 60065
(The Standard for Information Technology Equipment Including Electrical
Business Equipment).
Unpacking
The shipping box contains:
This Owner’s Manual
XTD-33 Screw Terminal Plugs (4)
Power Cord IEC type for the country specified when ordered
Backup Power Transformer (Stepdown Transformer also required for the
Backup Transformer in 230 VAC systems)
Configurations
The XTD has three available channels which may be configured with two or
three bands for each channel simultaneously. Inputs and outputs may
individually be configured as balanced or unbalanced. When an input or
output is used in the unbalanced mode, the negative signal should be
connected to signal ground (“E”).
Options
If the standard speaker selections do not match your configuration, USL may
be able to provide you with a customized program to optimize your audio.

XTD-33 INSTRUCTION MANUAL ULTRA★STEREO LABS, INC.
- 7 -
Technical Specifications
• Size: 1 unit Rack Mount (standard reference) 19" wide (including rack
ears; 17.5" chassis only), 8" deep, 1.75" high
• Weight: 8 lbs.
• Electrical: AC mains 115VAC @ 1 Amp or 230VAC @ 1 Amp
• Backup Power: 16VAC @ 750mA. A 115VAC wall mount AC adapter is
supplied with the unit.(230VAC operation requires a stepdown trans-
former.)
• Audio Inputs: 0dB ref. - 300mV rms, +26dB maximum Balanced/Unbal-
anced via one 10-pin detachable screw terminal plug for Left, Center, and
Right channels
• Audio Outputs: Two or Three Bands for each Channel. Transformer Simu-
lated Balanced/Unbalanced via three 10-pin detachable screw terminal
plugs, one for each channel. Nominal levels are unity gain relative to the
input levels adjustable by the front panel volume controls (0-100%).
Declaration of Conformance, CE
Meets intent of Directive 89/336/EEC for Electromagnetic Compatibility and
93/68/EEC Low-Voltage Directive 73/23/EEC for Product Safety. Compliance
was demonstrated to the following specifications as listed in the Official
Journal of the European Communities:
EN55103-1: 1999 - Emissions:
IEC1000-3-2 - Limits for Harmonic Current Emission
IEC1000-3-3, Part 3 - Limits of Voltage Fluctuations and Flicker in
Low Voltage Supply Systems
EN550103-2: 1999 - Immunity:
EN55013 Sec 3.2 - Mains Terminal Disturbance
EN55013 Sec 3.5 - Disturbance Power Test
Low Voltage Directive 73/23/EEC:
EN 60065 - Safety of Information Technology Equipment,
Including Electrical Business Equipment

XTD-33 INSTRUCTION MANUAL ULTRA★STEREO LABS, INC.
- 8 -
Ll Lm Lh Cl Cm Ch Rl Rm Rh
PROGRAM
SELECT
OUTPUT LEVEL ADJUST
BYPASS
MODE
LEFT RIGHTCENTER
RS-232
Quality Cinema Products
POWER
ON
XTD-33
DIGITAL CROSSOVER
THREE CHANNEL, THREE WAY
SIGNAL INPUT
Yellow = 0Db Ref
0
1
2
3
4
5
6
7
8
9
A
B
C
D
E
F
0
1
2
3
4
5
6
7
8
9
A
B
C
D
E
F
DPU04
ON
123 4 5 67
8
XTD-33 Front Panel

XTD-33 INSTRUCTION MANUAL ULTRA★STEREO LABS, INC.
- 9 -
1. Output Level Adjust - Nine multi-turn potentiometers to set the individual output levels for each
frequency band in each channel.
2. Bypass Mode - These switches configure the bypass electronics for either two-or-three-way opera-
tion (should always be set to match the speaker configuration). Up (or ON) is two-way; Down (or OFF) is three-way. All switches must be set the same way - either all Up or all Down.
3. Program Select - These two switches determine the processing applied to the signals and output
configuration. These must be set to match the speakers according to the chart in the Appendix or the speakers may be damaged.
4. Signal Input LED - These indicate whether the XTD is receiving the proper signal level. Off indi-
cates the level is below -54 dB. Green indicates the signal is present at normal levels. Yellow indicates the signal is within ±0.5dB of the 0dB (300mV rms) reference point. Red indicates that the signal is over +23dB and in danger of clipping or distorting.
5. RS-232 Port - This port is used to update the firmware. This must be done by a qualified techni-
cian. Instructions are included in the update package.
6. Power LED - Under normal conditions, with the Power Switch On and no faults, the LED will be
Green and the unit will be operating in the Digital Mode. If the unit is operating in the Bypass (analog) Mode, the LED will be Red and may indicate that servicing is required.
7. Power Switch - Controls the primary power to the XTD. Must be On to operate in the Digital
Mode.
8. Access Panel Cover - Protects the XTD settings and keeps the dust out.

XTD-33 INSTRUCTION MANUAL ULTRA★STEREO LABS, INC.
- 10 -
XTD-33 Rear Panel
RIGHT CENTER LEFT
INPUTS RIGHT CHANNEL OUTPUTS CENTER CHANNEL OUTPUTS LEFT CHANNEL OUTPUTS
HIGH MID HIGH MID LOW HIGH MID LOW
XTD-33
DIGITAL CROSSOVER
WARNING: TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK, DO NOT EXPOSE THIS APPLIANCE TO RAIN OR MOISTURE. DO NOT REMOVE COVER. NO USER SERVICABLE PARTS INSIDE. REFER SERVICING TO QUALIFIED PERSONELL. FOR CONTINUED PROTECTION AGAINS FIRE OR SHOCK HAZARD, REPLACE ONLY WITH THE SAME FUSE TYPE AND RATING.
FUSE 1A 250V
Main Power
115/230 VAC
50/60Hz, 40VA
Emergency
Bypass
Power
16VAC
500MA
LOW
1
2
34567
115V
230V

XTD-33 INSTRUCTION MANUAL ULTRA★STEREO LABS, INC.
- 11 -
1) IEC Power inlet - Accepts a standard IEC cord 2) Fuse Holder - Determines AC Mains configuration. Must be set to match the local AC Mains
voltage or the XTD may be damaged or not operate properly.
3) Emergency Bypass Power - Connect the furnished external power supply here. 4) Inputs - Accepts the Left, Center, and Right signals from the Cinema Processor or other audio
source. Balanced or Unbalanced signals may be used. In Unbalanced mode, the negative signal input should be connected to audio source ground.
5) Right Channel Outputs - Provides the signal outputs from the XTD in two or three bands as
determined by the Program Select and Bypass Mode switches on the front panel. Balanced or Unbalanced signals may be used. In Unbalanced mode, the negative signal should be connected to signal ground (“E”).
6) Center Channel Outputs - Provides the signal outputs from the XTD in two or three bands as
determined by the Program Select and Bypass Mode switches on the front panel. Balanced or Unbalanced signals may be used. In Unbalanced mode, the negative signal should be connected to signal ground (“E”).
7) Left Channel Outputs - Provides the signal outputs from the XTD in two or three bands as deter-
mined by the Program Select and Bypass Mode switches on the front panel. Balanced or Unbal- anced signals may be used. In Unbalanced mode, the negative signal should be connected to signal ground (“E”).

XTD-33 INSTRUCTION MANUAL ULTRA★STEREO LABS, INC.
- 12 -
Input
Buffers
A/D
Converters
DSP
Digital
Filters
Program
Select
D/A
Converters
Analog
Filters
Bypass
Circuitry
Bypass
Control
Volume
Controls
Output
Buffers
2 or 3
Way
XTD-33 Block Diagram

XTD-33 INSTRUCTION MANUAL ULTRA★STEREO LABS, INC.
- 13 -
Theory of operation
Normal operation
Under normal operation, the input signal is conditioned and converted from
an analog waveform to digital information at a sample rate of 96 kHz (twice
that of a normal music CD). The digital data is then processed in a single chip
Digital Signal Processor (DSP) which analyzes the waveform, breaks the
signal into the appropriate audio bands and impresses the desired acoustic
curve onto the information. These acoustic curves are shaped to match a
manufacturer’s specific speaker response selected by the switches on the
XTD front panel. The data is then converted back to analog waveforms and
passed through individual volume controls to the output Transformer Simu-
lators. The Simulators provide a balanced line output which may also be used
in an unbalanced configuration by shorting the unused output to ground
Speaker Protection (Anti-Thump)
To minimize damage to the speakers, an anti-thump system shorts the
balanced line outputs together during power on or off. However, to assure the
best protection, it is recommended that the power amplifiers always be the
last to be turned on and the first to be turned off.
Backup System
It is USL’s policy to try to provide a “safety net” when possible. The backup
system here allows the XTD to continue to operate if the primary XTD power
supply fails or there is a malfunction in the Digital Signal Processing part of
the unit. The Backup Power Transformer constantly feeds into the analog
portion of the circuitry, should the primary supply fail, the backup will take
its place and the Power Supply LED will change from green to red. The Input
signals will be rerouted around the digital portion of the circuitry and into a
conventional analog crossover. This crossover can be configured as either a
two-or-three-band type by means of front panel switches. The signals are then
directed to the volume controls as noted in the Normal Operation above.
These crossovers are of a generic 12dB per octave type but would not be
optimized for all models of speakers. The crossover points are located at
approximately 500 Hz and 1800 Hz in the three-band mode and 500 Hz in
the two-band mode. Should the digital processing malfunction for some
unforeseen reason, turning the power switch off will activate the bypass
system. Obviously, the Backup System is intended for temporary use until the
unit can be restored to proper operation.

XTD-33 INSTRUCTION MANUAL ULTRA★STEREO LABS, INC.
- 14 -
Installation
Equipment needed
Small Phillips screwdriver
Straight blade screw driver with 1/8" wide tip (or slightly smaller) or
alignment tool
Wire strippers
Audio Cable - (determine your configuration first)
For Balanced and Unbalanced Lines - Individual two-conductor
with shield or
three pairs cable with individual shield per pair
Two AC mains Outlets (one for mains power, one for the backup
power adapter)
System Hardware Mounting and Grounding
Rack mount the XTD with bolts (not supplied) appropriate to your setup. To
assure good chassis grounding, use a star washer between at least one bolt
head and XTD.
Power Connection, Main Voltage Selection, and Fuse
Determine whether 115 or 230 VAC operation.
For 115VAC Operation:
(A 1 Amp fuse has been installed in the fuse holder at the factory.)
1) Verify that the fuse holder is installed into the IEC connector housing
so that the “115” is correctly oriented and readable.
2) Insert the IEC power cord with the appropriate plug into the IEC
connector and the AC mains source
3) Emergency Power Supply - Plug the power adapter16VAC plug into
the jack on the rear of the XTD.
4) Insert the adapter into the AC mains source

XTD-33 INSTRUCTION MANUAL ULTRA★STEREO LABS, INC.
- 15 -
For 230VAC Operation:
1) Insert/verify a 1 amp fuse is in the fuse holder.
2) Insert the fuse holder into the IEC connector housing so that the “230”
is correctly oriented and readable.
3) Insert the IEC power cord with the “Euro” plug into the IEC connector
and the AC mains source
4) Emergency Power Supply - Plug the power adapter16VAC plug into
the jack on the rear of the XTD.
5) Plug the power adapter into a stepdown transformer.
6) Insert the transformer/adapter into the AC main source.
FUSE 1A 250V
Main Power
115/230 VAC
50/60Hz, 40VA
Emergency
Bypass
Power
16VAC
500MA
115V
230V
XTD-33 Power Connection

XTD-33 INSTRUCTION MANUAL ULTRA★STEREO LABS, INC.
- 16 -
Rear Panel Signal Input Connections
Balanced Inputs
The XTD has balanced inputs for the cleanest possible signal. For each
channel, connect the audio source positive output to the positive input of the
XTD. Connect the audio source negative output to the negative input of the
XTD. Connect the cable shield only to the XTD signal ground (“E”) to
minimize hum due to ground loops.
RIGHT CENTER LEFT
INPUTS
Balanced Input
RIGHT CENTER LEFT
INPUTS
Unbalanced Input
GND
Unbalanced Inputs
For each channel, connect the audio source positive output to the positive
input of the XTD. Connect the audio source negative output to the negative
input of the XTD. Connect the cable shield only to the XTD signal ground (“E”)
to minimize hum due to ground loops.

XTD-33 INSTRUCTION MANUAL ULTRA★STEREO LABS, INC.
- 17 -
Rear Panel Signal Output Connections
Three-Way Crossover Connection - use all three output bands: Low, Mid, High
Two-Way Crossover Connection - use only Low and High bands
Balanced Outputs
For each band in each channel, connect the XTD positive output to the
positive input of the Amplifier. Connect the XTD negative output to the
negative input of the Amplifier. Connect the cable shield only to the Amplifier
signal ground to minimize hum due to ground loops
LEFT CHANNEL OUTPUTS
HIGH MID LOW
Channel 1 +
-
GND
NO SHIELD
CONNECTION
Balanced Output
LEFT CHANNEL OUTPUTS
HIGH MID LOW
Channel 1 +
GND
Unbalanced Output
Unbalanced Outputs
The outputs of the XTD use a solid state transformer simulator. BOTH
POSITIVE AND NEGATIVE OUTPUTS MUST BE CONNECTED SOME-
WHERE. (If your Amplifier does not have balanced inputs, the XTD negative
output needs to be connected to the XTD signal ground [“E”] by a short piece
of wire.) For each band in each channel, connect the XTD positive output to
the positive input of the Amplifier. Connect the XTD negative output to the
signal ground output (“E”) with a short piece of wire. Connect the cable shield
only to the Amplifier to minimize hum due to ground loops
Optional Signal to Chassis Grounding
If you wish to connect the Signal Ground (“E”) to the Chassis Ground, install
a jumper between the two left terminal block pins on only one of the terminal
blocks (any terminal block).
Optional Chassis Grounding

XTD-33 INSTRUCTION MANUAL ULTRA★STEREO LABS, INC.
- 18 -
Front Panel Controls
• The only control designed to always be available is the Power Switch. In
the ON position power is supplied via the AC Mains, the Power LED will be
Green, the Digital Crossover section of the XTD is enabled, and the Analog
crossover is disabled. When the Power Switch is in the OFF position, power
is supplied by the Emergency Bypass Supply, the Power LED will be Red, the
Digital Crossover section of the XTD is disabled, and the Analog crossover is
enabled.
• Behind the access panel are the Digital Configuration switches, Analog
Crossover Mode selector switches, and the volume controls for the nine
outputs. Digital Configuration switches allow for 100 different speaker
configurations as identified in the Appendix.
Analog Crossover Mode selector switches allow the emergency bypass
circuitry to be configured for two-way or three-way systems and should be set
to match the Digital Configuration. Up (or On) is two-way; Down (or Off) is
three-way.
The Volume Controls allow the nine output signal levels to be adjusted. These
work in either the Normal or Bypass modes and adjustment should not be
needed when switching between the two.

XTD-33 INSTRUCTION MANUAL ULTRA★STEREO LABS, INC.
- 19 -
Alignment
Ll Lm Lh Cl Cm Ch Rl Rm Rh
PROGRAM
SELECT
OUTPUT LEVEL ADJUST BYPASS
MODE
0
1
2
3
4
5
6
7
8
9
A
B
C
D
E
F
0
1
2
3
4
5
6
7
8
9
A
B
C
D
E
F
DPU04
ON
Selecting Speaker Type
CAUTION: Incorrectly setting the Speaker Type selector switches can
damage speakers. Verify settings before activating amplifiers.
1) Turn the amplifiers off.
2) Turn the XTD off.
3) Use the chart in the Appendix to determine the setting that matches
your speakers. If your speakers are not listed, please contact USL.
4) Use a small screwdriver to set the rotary switches to the matching
setting.
5) Set the Bypass Mode switches to match the speaker configuration,
two-or-three-way. Up (or ON) is two-way; Down (or OFF) is three-
way. All switches must be set the same way - either all Up or all
Down.
6) Turn the XTD Volume pots fully counter-clockwise.
7) Set the Cinema Processor equalizer (or room equalizer) to “flat” (no
gain or attenuation) for all channels.
Setting Input levels
1) Turn on the XTD (but not the amplifiers).
2) Use a Pink Noise generator or other 0dB reference signal in the
Cinema Processor.
3) Note: The XTD is designed to accept signal levels up to +26dB
(6.25V rms) with a 0dB reference of 300 mV rms.